Cant start up

I decided to start deleting programs on my Desktop,(thinking i was cleaning up) anyhow i have obviously deleted something that makes the monitor work , each time i restart the monitor comes up with Del-enter set up & F12 -reboot. but then monitor comes up with message "input not supported" VERY FRUSTRATING" anyway i tried using thumb drive to down load drivers from my lap top (windows XP) anyhow that hasnt worked.......pls pls pls help...........i am totally not computer minded!!! hence why im in this mess :)

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